Systems and methods for generating a digital representation of a 3D object

A dental scanning system for generating a digital three-dimensional representation of a dental object, the dental scanning system comprising:

• an intraoral scanning device comprising:
• one or more projector units configured to project a pattern on a surface of the dental object, wherein the pattern comprises a plurality of pattern features arranged in a regular grid;
• two or more cameras configured to acquire one or more sets of images, wherein each set of images comprises at least one image from each camera, wherein each image includes at least a portion of the projected pattern, wherein the images within a set of images are acquired simultaneously;
• one or more processors configured to:
• determine one or more image features within each set of images;
• solve a correspondence problem within each set of images such that points in 3D space are determined based on the image features, wherein said points form a solution to the correspondence problem, wherein the correspondence problem is solved for groups of pattern features;
• generate a digital three-dimensional representation of the dental object, wherein the solution to the correspondence problem is used to generate the three-dimensional representation
• divide the pattern features into one or more group(s) of pattern features for each set of images, wherein each group of pattern features is a connected subset within the regular grid, wherein each group of pattern features comprises at least 15 pattern features;
• and
• determine a solution to the correspondence problem within each group of pattern features.